Electronics Forum | Sat Mar 21 12:19:51 EST 1998 | David Pick
I have read somewhere of a ratio of component weight vs. surace contact area rule for double reflow soldering. This ratio is the maximum weight vs. surface tension to hold a component on during the second reflow. With this number, a person could weig
Electronics Forum | Wed Aug 19 19:16:43 EDT 1998 | Steve
How is the aspect ratio of a reliable BGA joint defined? Is it best to have H/W between two limits? What are these?
Electronics Forum | Fri Aug 21 15:03:42 EDT 1998 | Dave F
| How is the aspect ratio of a reliable BGA joint defined? Is it best to have H/W between two limits? What are these? Steve: People on TechNet have spent alot of time talking about BGA pad design. Use the link below. Dave
Electronics Forum | Fri Apr 05 11:18:20 EST 2002 | habs24
Anyone have experience using Dupont CB100 for high aspect ratio via fills? Or even where I could get more information on the processes involved? Thanks in advance...
Electronics Forum | Wed May 22 12:32:49 EDT 2002 | pwrgroup
which stencil vendor can deliver aspect ratio and area ratio and the statistical information to the user?It's difficult if the pad is modified.
Electronics Forum | Wed May 22 12:39:00 EDT 2002 | pwrgroup
and the two ratio is changed if you use different thickness sheet or step-down or step-up.I think real time calculator of the two ratio is very important for tranfer efficience.
Electronics Forum | Mon Jun 30 19:52:39 EDT 2003 | Mark Coplan
If you would email me your aperature ratio on the excell spreadsheet I would be most grateful Thanks, Mark
Electronics Forum | Mon Oct 27 14:06:10 EST 2003 | russ
Search the archives, plug in 0402 OR aspect ratio and you will find everything you need to know about area and aspect ratio. These are the critical formulas for paste release. Russ
Electronics Forum | Tue Dec 16 19:45:47 EST 2003 | Hiram
Hi, I am looking for the IPC criteria hole-to-lead ratio. Does anybody know a practical way to determine if some holes in my pcb's do not get enough solder in the wave solder machine because an inapropiate hole-to-lead ratio? Thanks in advance! Hi
Electronics Forum | Fri Jan 06 19:57:19 EST 2006 | abhinavajmera
What would be the most suitable expression for ratio of Volume of Alloy to Volume of Paste for a solder paste? For example if we use 63Sn/37Pb alloy with a 90 Wt% metal what would be an appopriate expression for the Volume Ratio?
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